Re: Is there a way to get "EINVAL" style string

Hi Michael

On 22/04/12 22:25, Michael Kerrisk (man-pages) wrote:

Hi Jon,

On Sun, Apr 22, 2012 at 11:14 PM, Jon Grant[off-list ref]  wrote:

quoted

Hello

I was looking at the man pages looking for a way to get a string of the
errno value meaning. This is kind of a user question.

This API returns "returns a pointer to a string that describes the error
code":

http://man7.org/linux/man-pages/man3/strerror.3.html

However, this is a description, e.g. "Invalid argument".  Is there a
function that would return "EINVAL" or "ENOENT" as the string?

None that I know of. (In passing, I dealt with exactly this problem
for my book with a script that generated the string names; see
http://man7.org/tlpi/code/online/dist/lib/ename.c.inc.html and
http://man7.org/tlpi/code/online/dist/lib/error_functions.c.html)

Interesting. I saw on the ename.c page that the numbers were in the 
table hard coded -- is it guaranteed that 90 will always correspond to 
EPROTOTYPE on a unixy system?

quoted

Could I suggest that the text on the man page be updated to clarify what
would be returned:

"returns a pointer to a string that describes the error code. e.g. "Invalid
argument" if EINVAL was the errnum."

Done for 3.40.

Great, thank you!
Jon
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